Abstract
In nonlinear analysis for performance-based design of reinforced concrete moment frames, a plastic hinge spring element is predominantly used in order to simply and accurately describe the inelastic behavior of beam–column joints, including strength degradation. Although current design codes and guidelines provide various beam–column joint models, the focus is on concentric beam–column joints. Therefore, more studies are required for eccentric beam–column joints, which are also common in practice. In the present study, to consider the effect of beam eccentricity on the behavior of beam–column joints, a simplified plastic hinge model was proposed using the effective joint width of current design codes. The proposed model was compared to the cyclic loading test results of beam–column joints with/without beam eccentricity. The comparison showed that the simplified plastic hinge model with the effective joint width of NZS 3101-2006 or Eurocode 8 is considered acceptable for design purpose.
Highlights
The use of total amount of joint hoop bars could overestimate the performance in the simplified plastic hinge model, for the beam–column joints with a wide column and large beam eccentricity
A simplified plastic hinge model was proposed using the effective joint width of current design codes, and it was applied to existing test specimens
In eccentric beam–column joints, the beam eccentricity reduces the effective joint shear area, which results in a decrease in the joint shear strength and more drastic strength degradation after the peak strength
Summary
For a safe and cost-effective design of building structures, the performance-based earthquake design is widely used. To consider the degradation in the shear strength of eccentric beam–column joints, a simple method of reducing the effective joint width was proposed [27,28]. The existing studies investigated the joint shear strength of eccentric beam–column joints, the deformation capacity and strength degradation were not evaluated, which were necessary for nonlinear analysis modeling. For a safer and more economical design of RC structures, the effect of beam eccentricity on the behavior of beam–column joints was investigated. To this purpose, the effective joint width of current design codes and the plastic hinge model of. The proposed method was compared to existing test results available in the literature
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